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Currently, high contrast colors come from IncreasedContrastThemeSupplier,
which needs to be recreated when the dark mode state changes. This change
has IncreasedContrastThemeSupplier observe the backing NativeTheme for
dark mode changes so that recreating it isn't necessary here.

Bug: 1046494
Change-Id: Ib5955064b43577e9836c3f4864e77601bdb3fbb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067468
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744697}